Why so much difference in performance between Thread and Task?

Question

Windows 7, Intel CORE i3, 64 bit, RAM 4Gb, 2.27 GHz
.NET Framework 4.0

I have the following code:

static void Main(string[] args)
{
             


        

Answer 1

Task.Factory.StartNew() does not start a task immediately it just schedules it so a TaskScheduled would be able starting it a bit later (depends on number of available threads/tasks).

MSDN saying that after Thread.Start() operating system can schedule it for execution, interactions with OS is much slower than with .NET Framework's TaskScheduler but not in such degree.

And back to your example, 0xFFF == 4095, so you are scheduling 4095 threads and this takes 40 seconds. 102 threads in a second is a pretty good timing! :)